Highly magmatic break-up LIP centres: revisiting the East Greenland volcanic rifted margin

M. Klausen
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引用次数: 1

Abstract

Abstract The decompressional release of magma at continental triple-rift break-up, large igneous province (LIP) centres, above mantle plume stems, results in highly magmatic settings. As a particularly well-exposed example, it is proposed that the East Greenland coastal dyke swarm preserves a structural record of how dyke dilations v. tectonic extension increased upon approaching its Kangerlussuaq triple rift centre. Such more magmatic break-up is reflected by how abruptly its volcanic rifted margin transitions into 100% dykes, and, in this case, up to 100 km further inland than its geophysically determined continent–ocean boundary. Correspondingly high magma flux through an igneous Kap Edward Holm centre sustained the lateral injection of up to 150 km-long dykes, evidenced by increased cut-off dyke thicknesses, below which there is an anomalously low abundance of thinner dykes, that conform to the cube root of their thermal arrest distance. Only the thickest and, thereby, longest dyke injections linked up with a more southerly located igneous Imilik centre of an en echelon offset dyke swarm, the complex transition into which is also addressed. This highly magmatic central plumbing system is further compared to similar volcanic zones across Iceland and other post-Paleozoic break-up LIPs in order to contextualize its importance.
高岩浆分裂LIP中心:重新访问东格陵兰火山裂谷边缘
在大陆三裂谷破裂、大火成岩省(LIP)中心、地幔柱茎之上,岩浆的减压释放导致了高岩浆环境。作为一个特别充分暴露的例子,有人提出,东格陵兰海岸堤防群保存了堤防扩张与构造伸展如何在接近其康克鲁斯瓦格三重裂谷中心时增加的构造记录。火山裂谷边缘突然转变成100%的岩堤,这反映了岩浆破碎的程度,在这种情况下,比地球物理上确定的大陆-海洋边界向内陆延伸了100公里。相应地,高岩浆通量通过一个火成岩爱德华霍尔姆火山中心,维持了高达150公里长的岩脉的侧向注入,证明了岩脉的截止厚度增加,在其以下有一个异常低丰度的薄岩脉,这符合它们的热阻距离的立方根。只有最厚和最长的岩脉注入与位于更南的雁梯状偏移岩脉群的火成岩拟米利克中心相连,并讨论了向其过渡的复杂过程。这个高度岩浆化的中央管道系统进一步与冰岛各地的类似火山带和其他后古生代破裂区进行了比较,以确定其重要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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